This cascade circuit was obtained from old Signetics documentation. The circuit makes use of special neon lamps that act as valves. Observe the high supply voltage.
For this function, a little more sophisticated, we need switches (keys) or double sensors. This is...
We found this circuit in an English publication in 1976. The circuit is based on the use of a...
This circuit is for old telephones with analog lines. It was found in the May 1988 Radio...